Formation of the CaiiK-line core with arbitrary temperature minima
✍ Scribed by Herbert A. Beebe
- Publisher
- Springer
- Year
- 1971
- Tongue
- English
- Weight
- 639 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0038-0938
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✦ Synopsis
The formation of the solar Call K-line core is studied under the assumption of a two component chromosphere for many atmosphere models, which are tested by comparing observed and calculated average intensity profiles at several places on the solar disk. Non-LTE-line profile calculations are made using model atoms of two and three bound levels while the value and depth of the temperature minimum and turbulent velocity gradient are varied. A critique of several broad types of models is provided.
Limb darkening of the entire core, a K1 radiation temperature of 4300K and increasing limbward separation of the K2 peaks are predicted by a combination of a 'cool' component, covering 90 % of the solar disk, and a 'hot' component, representing the bright calcium network. The optimum cool component is characterized by a 4200K temperature minimum and low (~ 1 km/sec) microturbulent velocities. The hot component begins its outward temperature rise in the photosphere at 4300K and is never more than 500K hotter than the cool component.